Silencer for gas-engine-valve mechanism



' Dee. 15, 1925. 1.565.712

G. H. CHARNOCK 'SILBNCER FOR GAS E-NGINE VALVE IECHMIISI F1e d Feb. 6, 1925 2 Sheets-Sheet 1 Dec.Y 15, 1,925-

l G. H. cHARNQcK SILENCER FOR GAS ENGINE VALVE IBCHAIISI Filed Feb. 6. 1923 2 Santi-Shut 2 bw m l Patented Dec. 15, 1925.

UNITED sTArEs GEORGE H. CI-IKINOCK7 OF BUFFALO, NEW YORK.

SILENCER FOR GAS-ENGNE-VALVE MECHANISM.

Application led February G, 1923.

To all whom t may concern:

Be it known that I, GEORGE H. Crmnivocn, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Silencers for Gas-Engine- `Valve Mechanism, of which the following is a specification.

This invention relates to a device for taking up the slack in the operating mechanism of an overhead gas engine valve at a 4point outside of the crank case or lower enclosed. part of the engine frame, so that any noise which is produced when the parts become worn will knot be audible and thus render the operation of the engine more pleasant and satisfactory.

It is the purpose of this invention to provide simple and eiiicient means whereby the slack in this type of valve operating mechanism is taken up automatically between the rock lever of each valve and the corresponding push rod which is actuated by a cam, the structure being such that the same can be applied to overhead valve gas engines without requiring any change in the construction of the valve mechanism as now found on the market.

In the accompanying drawings:

Figure 1 is a fragmentary vertical section of an internal combustion engine having its valve mechanism equipped with my invention. Figures 2 and 3 are perspective views of the yoke and coupling block forming part of the take-up device containing my improvements. Figure 4 is a fragmentary top plan view of the engine embodying my improvements. Figure 5 is a fragmentary view, on an enlarged scale, of those portions of the valve mechanism immediately adjacent to where the rocker arm, push rod and valve stem come together. Figures 6 and 7 are horizontal sections taken on the correspondingly numbered lines in Fig. 5.

Similar characters of reference indicate corresponding parts throughout the several views'. Y

This invention is applicable to gas engines which may vary as to details of construction, that shown inthe drawings, being merely typical of one in which my inven tion can be used to advantage. As shown, this engine comprises a body or frame 5 containing an upright cylinder 6, a head 7 at the top of the cylinder, and a piston 8 reciprocating vertically in the cylinder and Serial No. 617,360.

having its connecting rod 9 coupled. with the crank of the driving shaft in any way suitable and well known manner.

lilith each cyiinder is associated a valve mechanism comprising a 'uel inlet valve and an exhaust valve by means of which live gaseous fuel-is admitted. to the cylinder and the products of combustion are dis charged therefrom. rlfhe inlet and exhaust valves are operated. respectively by means which comprise rock levers 10, 11, and the mechanism associated with the inlet and exhaust valves is identical in construction, the following description relating to the mechanism for operating the inlet valve 12, will, so far as it applies, also serve to describe the mechanism for operating the eX- liaust valve.

The inlet valve 12 is of the usual circular outwardly tapering form and adaptedL to move vertically toward and from a valve seat 13 arranged around the inner end of the fuel'inlet or passage 14 in the head of the body. On its upper side this valve is provided with a vertical valve stem 15 which extends to the exterior ot the body and has its intermediate part guided in a sleeve 16 mounted in the upper part of the head.

Each of the valves is yieldingly held in its upper closed position by a collar 17 preferably of cap shaped form mounted on the upper part of each valve stem and engaging its upper side with a shoulder Y.

formed by a washer 19 interlocking with the valve stem, and a helical spring 21 surrounding the valve stem and engaging its lower end with the guide sleeve 16 and its upper end with the underside of said collar, as shown in Figs. 1, 2 and 3.

The inlet andexhaust valve rock levers are pvotally supported side by side 0n a shaft 22 mounted on the top of the head and the inlet valve rock lever has its rocker arm 23 arranged over the upper end of the stem ofthe inlet valve while its tail 25 is provided with a downwardly opening socket 241 which receives the spherical knuckle 26 at the upper end of an upright push rod 27. The knuckle 26 has a screw connection with the push rod so that the same can be adjusted lengthwise therein by hand for taking up slack in the valve operating mechanism and after such adjustment has been effected, the knuckle is held in position by a clamping screw nut 20 arranged on the push rod and engaging the lower end ot the knuckle. ln the lower part ot the engine trame or body is rotatably mounted the valve shaft 28 which is provided with a rotary cam 18 engaging the lower end of a vertical tappet 29. rllhe latter slides in a guide sleeve 30 on the lower part ot the body or trame and transmits a lifting movement to the push rod through the medium ot a ball 3l interposed between the ball sockets 32, i'l, termed on the opposing Aends ot the tappet and push rod, as shown in Fig. l. As the high part ot the cam engages the lappet, the rock lever is turned in the direction for depressing Iand opening the valve and when the low part ot this cam is presented to the tappet7 the spring 2l is permitted to close the valve.

{lrdinarilv the underside of the rocker arm is set se close to the upper end et the valve stem by means of the band operable 'adjusting device between the tail 25 and the push rod 27, that the rocker arm and stein barely touch.

lllh'en wear occurs in the valve operating` mechanism, the distance between the rocker arm and the valve stem increases and this causes the rocker arm to engage the valve stein with a noisy click or tap which is not only annoyingy but also produces rapid wear on the co-operating; surfaces. 'llo avoid this, means are provided for constantly pulling upwardly on the push rod so as to hold the knuckle at its upper end in engagement with the tail ot the rock lever and the rocker arm ot the latter is in constant engagement with the upper end ot the valve stem, thereby transferring any looseness or slack in the valve operating mechanism to the ball joint bet 'reen the push rod and tappet` and the opposing surfaces ot the tappet and the cani, which places are located within the body, vtrame or casing ot the engine where the saune are almost, il' not entirely suppressed und therefore do not cause any annoyance.

The preferred torni ot my invention 'tor accomplishinn` this purpose is constructed as follows:

El represents a yoke ot lol-shaped form which has its legs 35 straddling the push rod and bearing with its cross piece 36 against one side ol the p'ush rod. The top et the yoke engages with the underside of the screw nut 2() which latter vin effect is part of the knuckle 2G and practically forms a downwardly-faeing shoulder on the latter. The distance between the legs of the yoke is equal to the diameter ot the push rod, so that the latter will lit lsnugly in the yoke when these `parts are assembled. Adjacent to the extremities of the legs of the yoke the same are rprovided on their inner opposing sides with two concave seats 3? which a're arranged concentrically relatively to each other and in etlect produce an enlargement ot the space between the legs ol the yoke on that side oit the push rod opposite to where the latter is engaged by the crosy piece of the yoke. Removably arranged tween the legs o'l` the yoke on that side ot the push rod opposite the cross piece ot the yoke and engaging with the seats 3T thereot is the upper reduced part oli a coupling' block which part is ot eyliiu'lrical Aloriu to lit said seats. l'lelow its upper part said coupling block is provided with an enlarejcd lower par 3i) forming; an upwardly turing' shoulder fit?- between said parts which enwith the underside ot' the yoke. latter is dclacl aoly ciiinnected with the couplinl block by a cotter pin l-l passing transversely through correspoifuiliiuf openings in the yoke lees and the upper reduced part ol the coupling` block. The upper part ot' the coupling` block Hts closely against the push rod and the lower enlarged part oi the same is provided with a curved recess on its side which receives the adjacent part ot the push rodr` thereby securely holding;` the yoke, block and push rod against lateral movement relatively to each other and avoidine any rattling' noise during the operation or the valve mechanism. The provision ot the recess 42 in the block also ensures assembling` the parts in a definitel 'manner inasmuch as the block cannot be inserted intoV the yoke unless the recess ol: the same faces the push rod, thus always bringing the openings 'of the coupling` block 'and the yoke into 'the proper position 'to receive the Cotter pin ell.

The coupling block, yoke and push rod are yieldingly pulled upwardly by means which comprise a helical take-up spring lil connected at its lower end with the outer side of the couplingl` block by means oit a screw -l--l-` or otherwisea while its upper end is secured lo a lixed support which inthe present instance consists preferably of ay horizont-al supporting: rod 15 arranged lengthwise over the engine body. The supportingr rod is preferably carried at suitable places by brackets l0 secured lo the same standards l? on which the shatt of the valve rock levers are mounted. The tension of the springl l?) operates to constantly draw the push rod upwardly against the tail ol: the roc lever and press the rocker arm olf the lever down-- wardly against the valve stem so as to prevent any slack or lost motion between these parts, but this spring;` is weaker than the niaiirvalve spring 2l, so as to ensure closing;` of `the valve at the proper time under the actionof the last mentioned spring.

By this means, the possibility of loosenes's between the exposed moving parts ot the valve mechanism is eliminated and as a result'these parts will not produce anytapping action or other objectionablenoise, out

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instead any slack or lost motion in the working parts will be concentrated at the joint between the tappet and push rod and between. the cam and tappet, the location of which is inside of the engine body and therefore no noise made by the same would be perceptible. 1

Aside from rendering the operation of the valve mechanism noiseless, this device will automatically take up any wear on the external parts of the valve mechanism and thus avoid the necessity of frequently taking up such wear by means of manual adjustment of the parts.

Moreover, this improved take up device is of such a construction that the same can be readily and quickly applied to the standard forms oi engines now on the market without any alteration in the same. Owing to the simplicity of the device, the same can be produced at very small cost and as it contains no delicate parts the saine is notV liable to get out of order.

I claim as my invention:

l.. A valve mechanism for gas engines comprising a rock lever having a rocker arm adapted to operate a valve and a tail provided with a socket, a push rod adapted to be actuated by a cam and provided with a knuckle engaging with said socket and forming a shoulder on said rod, and means for yieldingly holding said knuckle in engagement with said socket comprising a yoke of U-shaped form engaging with the underside of said head and having its legs straddling said rod, and its cross bar engaging one side of the rod, a coupling block arranged between the legs of the yoke, and a spring connected at one end with said block and at its other end with said tail.

2, A valve mechanism for gas engines comprising a rock lever having a rocker arm adapted to operate a valve and a tail provided with a socket, a push rod adapted to be actuated by a cam and provided with a knuckle engaging with said socket and forming a shoulder on said rod, means for yieldingly holding said knuckle in engagement with said socket comprising a yoke of Ushaped form engaging with the underside of said head and having its legs straddling said rod and its cross bar engaging one side of the rod, a coupling block arranged between the legs of the yoke and engaging with the opposite side of said rod, and a spring connecting at one end with said block and at its other end with said tail.

3.`A valve mechanism for gas engines comprising a rock lever having a rocker arm adapted to operate a valve and a tail provided with a socket, a push rod adapted to be actuated by a cam and provided with a knuckle engaging with said socket and forming a shoulder on said rod, and means for yieldingly holding said knuckle in engagement with said socket comprising a yokeof U-shaped form engaging with the underside of said head and having its legs straddling said rod and its cross bar engaging one side of the rod, a coupling block engaging with the opposite side of said rod and having an upper reduced part which is secured between the legs of said'yoke and a lower enlarged. part bearing against the underside of saide yoke, and a spring con nected at one end with said coupling block and at its other end with said tail.

4T. A valve .mechanism for engines comprising a rock lever having a rocker arm adapted to operate a valve and a tail provided with a socket, a push rod adapted. to be actuated by a cam and provided with a knuckle engaging with said socket and forming a shoulder on said rod, and means for yieldingly holding said knuckle in engagement with said socket comprising a yoke of U-shaped 'form engaging with the underside of said head and having its legs straddling said rod, and its cross bar cngaging one side ot the rod, a coupling block engaging with the opposite side of said rod and arranged between the legs of the yoke and detachably connected therewith, and a spring connected at one end with said block and at its other end with said tail.

5. A valve mechanism for gas engines comprising a rock lever having a rocker arm adapted to operate a valve anda tail provided with a socket, a push rod adapted to be actuated by a cam and provided with a. knuckle engaging with said socket and forming a shoulder on said rod, and means for yieldingly holding said knuckle in engagement with said socket comprising a yoke of U-shaped form engaging with the underside of said head and having its legs straddling said rod, and its cross bar engaging one side of the rod, a coupling block engaging with the opposite side of said rod and arranged between the legs of the yoke, a pin passing through said yoke and block, and a spring connected at one end with said block and at its other end with said tail.

6. A valve mechanism for gas engines comprising a rock lever having a rocker arm adapted to operate a valve and a tail provided with a socket, a push rod adapted to be actuated by a cam and provided with a knuckle engaging with said socket and forming a shoulder on said rod, and means for yieldingly holding said knuckle in engagement with said socket comprising a yoke of U-shaped form engaging with the underside of said head and having its legs straddling said rod and its cross bar engaging one side of the rod,`a coupling block arranged between the legs of the yoke, a spring connected at one end with said block,

and a stationary rod connected with the other end of said spring.

7. A valve mechanism for gas engines comprising a rock lever having' a rocker arm adapted to operate a valvevand a tail provided with a socket, a push rod adapted to be actuated by a cam and provided With a knuckle engaging with said socket and forming a shoulder on said rod, and means for yieldingly holding said knuckle in engagement with said socket comprising a yoke of lc5-shaped form engaging with the underside oi said head and having its legs straddling said rod and its cross bar engaging one side of the rod, a coupling block engaging with the opposite side of said rod and having an upper reduced part which secured 1oetween the legs of said yoke and a lower enlarged part bearing against the underside of said yoke and having a recess on its inner side which receives the adjacent part of said push rod, and a spring connected with said coupling block.

S. A take-up device Jfor gas engine valve mechanism comprising a iJ-shaped yoke adapted to straddle a push rod and bear against a shoulder thereon, a coupling block secured between the legs of said yoke and engaging the adjacent side of said rod, and a spring for lifting said coupling block and yoke.

9. A take-up device for gas engine valve mechanism comprising a Ushaped yoke adapted to straddle a push rod and bear against a shoulder thereon, and provided on the inner sides of its legs With opposing recessesy a coupling block secured in the recesses of said legs and engaging the adjacent side ol: said rod, and a spring for lifting said block and yoke.

l0. A take-up device for gas engine valve mechanism comprising a U-shaped yoke adapted to straddle a push rod and bear against a shoulder thereon and provided on the inner sides of its legs with opposing recesses, a coupling block having a reduced upper part which is detachably secured to said legs Within the recesses thereof and engages With the adjacent side of said rod and an enlarged lower part Which is provided on its side with a recess adapted to receive said push rod, and a spring for lifting said coupling block and yoke.

GEORGE H. CHARNOCK. 

